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Straw L0 Trigger Studies. Vito Palladino NA62 Collaboration Meeting - Liverpool. The Idea. We would like to study the feasibility of Straw detector as a L0 trigger detector. Our read-out board (SRB) will be designed to collect the data and produce the L0 trigger primitives as well. - PowerPoint PPT Presentation
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Straw L0 Trigger Studies Vito PalladinoNA62 Collaboration Meeting - Liverpool
The IdeaWe would like to study the feasibility of Straw
detector as a L0 trigger detector.Our read-out board (SRB) will be designed to collect
the data and produce the L0 trigger primitives as well.◦ We will have 2 SRB per view => 8 per station => 32 in
totalOne possible way to use the Straw as a trigger
detector is to fast identify the vertex. The present talk presents the results we had for simulated Kp -> Pip nu nubar events.
NO time simulation has been introduced.Drift time will not be considered and Leading-Trailing
matching is not foreseen.No straw efficiency curve is simulated.
Why?From Spasimir table
Dataset50k events of Kp -> Pip nu nubar have been
simulated with GTK, CEDAR and Straw on. The decay region allowed is 90m -> 250m. No pile-up simulated.
Tracking In order to track charged particles the detector is divided in
corridors (group of 6 straws) two neighbor corridors have 2 common straws.
Corridor shape has been defined in order to maximize the number of straws in one corridor.
First two chambers are considered for tracking. No drift time is considered. One coordinate (XYUV) is
measured doing the mean of the position of the hit straws.
Tracking In order to track charged particles the detector is divided in
corridors (group of 6 straws) two neighbor corridors have 2 common straws.
Corridor shape has been defined in order to maximize the number of straws in one corridor.
First two chambers are considered for tracking. No drift time is considered. One coordinate (XYUV) is
measured doing the mean of the position of the hit straws.
Corridor Occupancy The number Straw Hit per
Corridor
How toIn order to recognize events with at least 2
straws the idea is to push data in a 40MHz buffer and wait for 2 leadings in a corridor. The data from each SRB are than collected by an other SRB who will provide the L0 primitive.
For details see Peter’s talk.
Data
Push
ing
Straw 0
Straw 1
Straw 2
Straw 3
Straw 4
Straw 5
25ns
OccupancyThe number of views hit.
OccupancyReconstructed coordinates.
Vertex ResolutionReconstructed vertex using the nominal beam
position has been performed. Vertex reconstructed contributions using different number of views have been highlighted.
Vertex ResolutionSingle contributions to the
resolution.
Vertex Resolution Z Dependence
MCT vetex (m)
MC
T v
ete
x –
Reco
Vert
ex (
m)
GTK3
Straw0
Vertex Resolution Z Dependence
Signal Acceptance
Reco Vertex Cut
# ev MCT # “Triggers” Acceptance
105 > 165 15925 16847 0.896173
102 > 175 16436 18605 0.92493
102 > 180 16649 19024 0.936916
The signal acceptance has been estimated as the ratio of the total number of events with the triggered events with the real vertex in the fiducial region (105 >165) and the total number of events in the FR (17770).
Conclusions and PlansPreliminary results are encouraging
us to go further in our studies.We have some inputs to finalize the
SRB design.We have many things to add to the
simulation:◦Timing (fundamental to understand our
capability to disentangle events with many tracks)
◦Pile-up simulation◦Corridor clustering